19941429391 has 4 divisors (see below), whose sum is σ = 21475385512. Its totient is φ = 18407473272.

The previous prime is 19941429349. The next prime is 19941429457. The reversal of 19941429391 is 19392414991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19392414991 = 349 ⋅55565659.

It is a cyclic number.

It is not a de Polignac number, because 19941429391 - 2²⁷ = 19807211663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19941429311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766978041 + ... + 766978066.

It is an arithmetic number, because the mean of its divisors is an integer number (5368846378).

Almost surely, 2^19941429391 is an apocalyptic number.

19941429391 is a deficient number, since it is larger than the sum of its proper divisors (1533956121).

19941429391 is a wasteful number, since it uses less digits than its factorization.

19941429391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533956120.

The product of its digits is 629856, while the sum is 52.

The spelling of 19941429391 in words is "nineteen billion, nine hundred forty-one million, four hundred twenty-nine thousand, three hundred ninety-one".